There has been a fierce debate in the Assembly since the First Minister, Carwyn Jones, dismissed claims that food hygiene standards have not improved in Wales since the series of E. coli outbreaks in 2005.
[Source]

Wfft as the exclaimation of rejection and dissatisfaction is used in such phrases as ‘naw wfft i …’ (to hell with …) and ‘gweiddi wfft i’ (shout wfft to ie. protest against).
Wfftio when meaning a sense of ‘despise’ is used in the bible ‘Peidiwch wfftio proffwydoliaethau.’ – Do not despise prophecies. (Thessalonians 5:20)

Your impression probably comes from the unusual double letters in Welsh and the ‘w’ and ‘ŵ’ that are used to spell the sounds we spell as short and long ‘oo’ in English. Welsh ‘u’ spells either a [i] sound or a more central high vowel, depending on the region. And depending on its position in a word, ‘y’ stands for the same sound or a neutral vowel like ‘a’ in ‘about’.

The double ‘dd’ spells the consonant of ‘the’, the double ‘f’ spells our usual ‘f’ whereas a single ‘f’ spells ‘v’ like the ‘f’ in ‘of’ exceptionally does in modern English. (Old English used to spell the [v] sound with ‘f’, like Welsh still does.) And double ‘ll’ stands for a voiceless equivalent of [l].

So Welsh isn’t really short of vowels – it actually has a relatively large inventory –, but just uses letters we reserve for consonants as vowel letters.

That’s fascinating :) Thanks for the breakdown. I figured that there had to be more vowels than immediately met the eye. And I suppose it was rather Anglocentric of me to not realize that what might be used as a consonant in other languages is, in fact, used as a vowel in Welsh. Regardless, it seems like a seriously difficult language.

Some words adapted in to Welsh phonetics demonstrating the point which Christopher concisely stated above:
cangarw
Wranws
alwminiwm
mercwri
plwtoniwm
I don’t think I need to add the English for these words as they’re pretty easily recognizable.

I’m always baffled by this. It was only a few years ago that I realised that English speakers didn’t see w and y as vowels. They’re so obviously vowels to a Welsh-speaker that I’m at a loss to why anyone would think they’re consonants. How can you look at a ‘w’ and ‘y’ and not think of it as a vowel?